Long-time Metal Slug villain Morden has teamed up with an organisation of cyber-terrorists known only as 'Amadeus' to spread a crippling computer virus called 'White Baby'. If transmitted, the virus could break through all security systems and give these evildoers access to every country's military systems.

It's up to Marco and Fio, along with new recruits Trevor and Nadia to battle through Morden's troops - as well as zombies, Yetis and some truly colossal bosses - to save the day. As ever, the Metal Slug tank is on hand to lend some much-needed extra firepower, and there's plenty of bearded hostages just waiting for you to rescue them in return for precious power-ups.